ARM: imx: Switch imx7d to imx-cpufreq-dt for speed-grading

The imx-cpufreq-dt driver can handle speed grading bits on imx7d just
like on imx8mq and imx8mm.
Signed-off-by: Leonard Crestez <leonard.crestez@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/mach-imx/mach-imx7d.c

@@ -97,6 +97,12 @@ static void __init imx7d_init_machine(void)
 	imx7d_enet_init();
 }
 
+static void __init imx7d_init_late(void)
+{
+	if (IS_ENABLED(CONFIG_ARM_IMX_CPUFREQ_DT))
+		platform_device_register_simple("imx-cpufreq-dt", -1, NULL, 0);
+}
+
 static void __init imx7d_init_irq(void)
 {
 	imx_init_revision_from_anatop();
@@ -113,5 +119,6 @@ static const char *const imx7d_dt_compat[] __initconst = {
 DT_MACHINE_START(IMX7D, "Freescale i.MX7 Dual (Device Tree)")
 	.init_irq	= imx7d_init_irq,
 	.init_machine	= imx7d_init_machine,
+	.init_late      = imx7d_init_late,
 	.dt_compat	= imx7d_dt_compat,
 MACHINE_END